Conflict between --output-dir and --output

Bug description

This is my minimal reproducible code. My question is whether there is a conflict between --output-dir and --output.

If my current path is /quarto_test, running the command

quarto render /quarto_test/mini_repeat.qmd --to docx 

will generate mini_repeat.docx in the /quarto_test directory.

If I run the command

quarto render /quarto_test/mini_repeat.qmd --to docx --output-dir /quarto_test/test/

it will generate mini_repeat.docx in the /quarto_test/test/ directory.

However, if I run the command

quarto render /quarto_test/mini_repeat.qmd --to docx --output-dir /quarto_test/test/ --output test.docx

it will generate test.docx in the /quarto_test directory.

Steps to reproduce

---
title: "Reproducible Quarto Document"
format: docx
engine: jupyter
---

This is a minimal self-contained reproducible Quarto document using `format: html` and `knitr` engine.
It is written in Markdown and contains embedded R code.

```{python}
print("Hello, world!")
```

![Here is an image available to everyone](https://placehold.co/600x400.png)

The end.
`````

### Expected behavior

I would like test.docx to be generated in the /quarto_test/test/ directory.

### Actual behavior

I would like test.docx to be generated in the /quarto_test/ directory.

### Your environment

ubuntu 22.04 vscode terminal

### Quarto check output

```
Quarto 1.5.45
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.2.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.41.0: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.5.45
      Path: /opt/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2024.06
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /home/jade/.TinyTeX/bin/x86_64-linux
      Version: 2024

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.9.6 (Conda)
      Path: /home/jade/anaconda3/envs/fnirs/bin/python
      Jupyter: 5.7.2
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.4.0
      Path: /usr/lib/R
      LibPaths:
        - /home/jade/R/x86_64-pc-linux-gnu-library/4.4
        - /usr/local/lib/R/site-library
        - /usr/lib/R/site-library
        - /usr/lib/R/library
      knitr: 1.46
      rmarkdown: 2.26

[✓] Checking Knitr engine render......OK
```

Reproduce the behavior with the two quarto render commands in the issue on Ubuntu and compare how --output-dir and --output determine the output path. The work is done when test.docx is generated inside /quarto_test/test/ while preserving the documented default behavior.